Tool-holding device.



No. 692,2l5. Patented Jan. 28, I902.

L, s. STARRETJZ TOOL HOLDING DEVICE.

(Application filed May 3, 1901.)

(No Model.)

WW M.

UN Tnn STATES PATENT OFFICE.

LAROY S. STARRETT, OF ATHOL, MASSACHUSETTS, ASSIGNOR TO TIIE L. S.STARRETT COMPANY, OF ATHOL, MASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

TOOL-HOLDING DEVICE.

SPECIFICATION forming part of Letters Patent N 0. 692,21 5, datedJanuary 28, 1902.

Serial No. 58,570. (No model.)

To all whom it may concern.-

Be it known that I, LAROY S. STARRETT, of Athol, in the county ofWorcester and State of Massachusetts, have invented certain new anduseful Improvements in Tool-Holding Devices, of which the following is aspecification.

The object of this invention is to provide a clamping device of a formespecially adapted to hold trammel-points and like tools firmly inposition adjustably along a bar to which it is desired to secure one ormore of such tools.

My improvement is embodied in a screwclamp of otherwise suitable formhaving its :5 outer face grooved to receive the trammel or like tool,the body of such clamp having a central perforation through such groove,in combination with a threaded screw having an enlarged head and stemseated in said perforation, a transverse opening through the screw bodyor stem for passage of the tramniel-point, a grooved cap fitting oversuch parts, and a terminal nut and interposed spring on said screw tohold the tool firmly or frictionally.

Details of construction are hereinafter pointed out, and the novelcombinations specified in the claims.

In the drawings, Figure l is an elevation 0 showing two of my improvedclamps applied to a bar and holding trammel-points. Fig. 2

is an enlarged edge view of the device in position for use, and Fig. 3 ahorizontal section on line 3 3 of Fig. 2.

A is the body of the clamp, a fine casting having a broad foot portion13 extending horizontally beneath the bar 0, a corresponding headportion D, threaded to receive the clampscrew E, which has the usualloose but-ton F at its tip. A novel feature of this clamp-body A is thegrooving of its outer vertical face to receive the trammel-point G or apencil or other tool. As indicated in Figs. 2 and 3, the

vertical groove has a depth equal to about half the diameter of trammelG. Another peculiarity of the clamp-body is that the inner face of itsvertical portion is recessed or hollowed out, leaving the marginsmaterially thicker than elsewhere. A central vertical rib is also formedon this inner face opposite 5e and asareinforce to the groove. (See Fig.3.)

About midway of its height the vertical part of the clamp-body isbroadened and then narrowed on curved lines, and through the center ofthis enlargement a circular aperture is formed, countersunk on its innerface. Through this aperture there projects a threaded screw H, theenlarged body or stem of which has a terminal flange fitting saidcountersink. (See Fig. 3.) Such body also has a large transverseperforation J, through which the trammel-point or like tool passes. Ahollow cap K, notched in its inner face to fit on the trammel, isslipped onto the screw H, covering and concealing its enlargedperforated 6 part, while its reduced threaded part protrudes, as in Fig.3, to receive the terminal nut L. This nut is recessed, as shown, toreceive a coiled spring M, surrounding said screw and bearing againstthe cap K. It will be seen that by tightening nut L the cap K is pressedinwardly against the trammel held in the groove in the clamp-body, andthe flanged head of screw H is held closely in its countersunk seat. Onloosening such nut L the direct pressure is relaxed and the trammel isheld adjustably, due to the action of spring M.

I claim as my invention 1. The tool-holding clamp described, comprisingthe clamp A B D E, its vertical body being grooved to receive laterallya trammel or other tool, such body being formed with an intermediateenlargement having a transverse aperture in the plane of said groove, incombination with a screw having an enlarged stem located in saidaperture, with a transverse perforation through it to receive such tool,and with a hollow cap and terminal nut; on said screw to secure the toolin position, on substantially as set forth.

2. The improved tool-holder, consisting of the clamp-body grooved in itsvertical face and having an opening through it, intersecting suchgroove, in combination with a screw having a threaded tip, a countersunkhead and enlarged stem located in said opening, In testimony whereof Ihave affixed my sigand a transverse perforation through such nature inpresence of two Witnesses.

stem to receive the tool held in the grooves of the clamp-body, and witha hollow notched cap, terminal nut and interposed spring ar- Witnesses:ranged on said screw, to secure the tool firmly or frictionally,substantially as set forth. 1

LAROY STSTARRETT.

DAVID FINDLAY, FRANK E. WING.

